May 25, 2012. The Delhi high court reserved its judgment in the Indraprastha Gas Limited's (IGL) case against Petroleum and Natural Gas Regulatory Authority (PNGRB). The sole supplier of compressed natural gas in Delhi/NCR has appealed in the court against the regulatory board's decision to regulate its network tariff and selling price. PNGRB, in its order dated April 9, 2012, had asked IGL to cut down its network tariff by 63 per cent. In a retrospective decision, it also asked the company to refund the difference to its customers for the period from April 1, 2008 till the date of issuance of order. IGL moved high court alleging that the regulator is not entitled to regulate the price of gas sold by the company and the variables taken into account by the board to calculate the network tariff are misleading.